Integration with Postfix becoming impossible

Hi everyone,

I have been battling with this for days. Postfix can only receive
messages sent to existing users (those that I have in /etc/aliases
or in /etc/passwd). When a reply message is sent, the reply address
is [email protected]. Postfix refuses to receive such
mail because while "user" may exist, [email protected] does
not exist. I tried getting postfix to take the regex,
/^user-confirm.*@example\.com$/ and have it send mail to "| tmda
/home/user/.tmda/config", but this does not work. Here is how I do it:

In /etc/aliases:

tmda     "| tmda /home/user/.tmda/config"

In /etc/postfix/main.cf:

virtual_alias_maps = hash:/etc/postfix/virtual

In /etc/postfix/virtual:

/^user-confirm.*@example\.com$/     tmda

I tried without the / /'s. I tried without ^ and $; nothing works :(.\
I even tried using regexs in /etc/aliases.

Is there a way to configure TMDA to reply-to just "user" and have
something in the body or headers telling tmda what message the response
or for?

I would appreciate any help with this.

Thank you very much.

-Andrey